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Jan. 1, 1929. 1,697,692 -M. POHLMANN X-RAY SYSTEM 2 Sheets-Sheet 2 Filed Nov. 50, 1926 INVENTflR Ma 1 Penna/v14 Hi'TOENEYS nan ronnmnn, or BERLrN-srnrumissrnnr, GERMANY, ASSIGNOR to enn ma ensntnscner'r run rrnnrzrnrscnn rnc Patented llani l, 19 29.

N 1 TE ta SIEMENS-BEINIGER- or annnm, GER

' Application flledlilovemb'er 30, 1926, Serial No. 151,781, and in This invention relates to improvements in X-ray systems, and has particular referautomatically lift oh and again apply at least one of the reinforcing sheets to the film.

The present invention makes use of a similar contrivanc'e for the production ofj wo exposures for stereoscopic observation that follow one another atsuch a brief interval of time that stereoscopic pictures can be made ofmovable objects, such as the lungs and the stomach. Q

In accordance with .the invention the above feature is eiiec'ted by coupling. the

drive for the movement of the film and of the reinforcing sheet with a switching device utilized to control two X-ray tubes. 'lhe movements of the reinforcing sheet and the film strip are preferably accomplished by the rotation of a motor in opposite diretcions. In'this connection, a movement, that is, as far as possible, free from jerks is to be produced. For this purpose, it is also expedient to utilize springs between the motor and the driven parts;

The present construction also admits of the introduction of the reinforcers, the film the switch 1 for controlling the. two X-ray and the motor in one roll holder.

The inventive. idea involvedvis illustrated in the accompanying drawings, wherein- I Figure 1 is a diagrammatic view of a system and apparatus embodying-the invention;

Figure 2 is a partly diagrammatic view showing the arrangement of thefilm and reinforciug sheet and-their connections with the motor; v

Figure 3 is a longitudinal section through a film holder showing the apparatus posi- 'tioned therein; and I Figure 4 is a fragmentary plan ly broken away and shown in'section'.

The apparatus shown in Figure 1 includes tubes and 70',

said switch being coupled With switch 2.in

the circuit of the motor 3 that moves the film and the reinforcing sheet.

A slow-acting relay '5 is utilized for revers ing thedirectiom ofirctation of the motor;

a circuit'interrupter 6 controls the length of film to be wound up; and furthermore winding 23 of the relay 5 '5, however, being slow,

.fact'that another circuit for net 7 is established by the closure of the left I lishes' a lochng vlew, part-.

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an electromagnet 7 is used for the switcg on of the tubes and influences the activity of the motor. Iii-addition, a time relay 9 is associated with a winding-up device 10, the

latter being controlled through a switch 11,

conductor 16, and the conductor 17 to the t :u- A T line 18. lhe motor be to operate d develops a moment of rotation ina clockwise direction. Another circuit is temporarily closed from the trunk line 13 through the right hand contact of the switch 12,. the normay closed contacts 19 and 20 ofthe electromagnet 7 theconductors21 and 22, the

contacts of the circuit interrupimrfi, the

24: and 17 to the trunk line 18. relay acting, does notattime, due to the the electromag tractits armature 4:? at this and the conductors the right-hand contact of Fill hand contact of the switch 12-, this circuit on tending from the trunk line 18 through said contact, the winding 41 of the electromagnet 7, the normally closed contacts 38 of the time relay 9,,and the contacts 56 of the device it) to the trunk line 13. The electromagnet Z is thereby energized and attracts its arms ture 25 to close the contact Slandthiiis open the normally closed contacts 19 and 20. The Y Y attraction of the armature 25 thereby estabcircuit for the magnet '2 extending from the trunk line 18 through the v I winding, 41- of the magnet, the contacts 38, said magnet to T the trunk line 13. 'liliereiere, the -la c the switch 12 at this time merely sets theme-"f.

and the contactsh'? and 58 of tor 3 in motion in a clockwise direction and I this motion serves to press the film, which has been previously drawn through by hand,

between a movable plate 28- (Figure-2) with a." reinforcing sheet 29 and .a stationary plate 26 having late 26 15 connected with the plate 28 by the reinforcing sheet 27 The not clockwise direction counter to the tension levers which are subject to the action of springs 31 that/act to turn the .levers in a counterclockwise direction 'andwthereby lift the plate 28 from the plate 26. The plate 28 is connected by means of a band 32 with the drum 33 which is rotatable about the shaft 33 and coupled b means of a geartransmission 65'with a isk 64 loosely laced upon the shaft 34 of the motor 3. his disk 64 is connected with the shaft by a spring 35 (Fi re 4) so that in case of rotation of the sha in the clockwise direction, the disk 64 iscarried alon by the shaft in consequence of the tightening up in the sprin but is able to yield in case of rotation in the opposite direction, i. e., at the lifting ofi' oft'he reinforcing sheet. As a result of the rotation.of'the armature 15 and the drum- 33, a pull is exerted upon the band 32 and the levers 3O consequently are turned in the of the springs 31 for the purpose of applying the reinforcing sheets 27 and 29 against the film stri 36. 'The film and the sheet in thenrea y for the exposure.

During'this time the armature 25 of the magnet 7 has established, through itscontact 37, a circuit for the main transformer 71- and the exposure then commences. The duration of\ the exposure is. determined by the adjustmnt of the time relay 9. When the latter runs down, the contacts 38 are interrupted by thecontact 40 which is actuated by the motor 39 of the relay, whereupon the locking circuit for themagnet7 is opened and said magnet de-en'ergizes. Furthermore, the contact 56 is interrupted by the movement of the motor 39 and the armature of the device 10 couled with said motor is moved to the dotted ine position shown in Figure 1'. In consequence of the de-energization of the magnet I 7 thelcircuit for the transformer 71-through thecontact' 37 is opened and the exposure of.

the first late is concluded. The de-energization of t e ma et 7 again closes the contacts 19. and 20 w ereupon the previously described circuit for the 'slow acting relay 5 is closedandsaid relay is energized at this time, due to the fact that the magnet7 re:

-'mains de-energized as a result of the opening of the contacts 38. The relay 5 attracts its armature 43 and moves the rod 47 to the left against the tension of the spring. 44. k Be. 68. tween the switch 1 andspring 44 the rod 47,

is provided with .a high tension insulation 45. The rod 47 is not firmly cou led with the lever of the switch 1, but, as in ic'ated iii the drawing by a hook at the end of the pull 'rod,'-

' in such a way that it can bring about only the movement of the lever'to one side, in'the direction from right .to left' in the drawing.

. This is necess'ar ,since a switching over of the motor has su 'se uentl'y still to be effected, for the purpose of t i e pressing on of thereinforcing sheet, by movement of the rod 47 in the direction towardthe right in tliedrawin in connection with which switching the left-hand terminal the X-ray tube 70 is disconnected from the transformer ,71 and the tube 7 0' connected therewith. While the tube 70 was in operation during the first exposure the tube 70 received a preliminary heating through the variable resistance 46.

The operation of the switch 2 now closes an obvious circuit through the winding 4 in different direction from thepreviously de-- scribed circuit for said winding, whereupon the motor 3 develops a moment of rotation in a counterclockwise direction and in so doing, by means of the drum 49 which is located on the shaft of the motor and connected with it I by a'spring 48, drawsthe film ahead by means of the band 50 after the springs 31 have lifted the plate 28 with its reinforcing sheet 29 off of the 'film' at the cessation of the peration of the motor in the clockwise direction. With .the film drum 49 there is coupled, for example by means of agear train 51, a disk 52 which carries an adjustable'contact 53. As soon as the film strip hasbeen drawn ahead the desired length the contact 53 strikes a contact of the interrrupter 6 and opens the latter. The circuit for the relay 5 is opened and said relay deenergizes whereupon the rod 47 is drawn to the right by the spring 44. As a consequence of this operation the fihn move-- 'ment stops and,'in the manner previously de scribed, the reinforcing sheets are pressed on the film by the movements of the contacts 2 to their right-hand position. The restoration of the rod 47 also effects the closure of the switch 11 whereupon a circuit is'closed for the energizati'on of the winding 54 of the device '10, which circuit extends from the trunk line 18 through the winding 54, the switch 11, conductor 21,- the contacts 20 and '19 and from'thence tot-he trunk line 13. Current flowing through this circuit influences o o 0 J u the wmding-up device wh ch then moves its armature 55 to the full-line position at which time the contacts 56 are again closed. Since at this time the winding-up operation of the relay 9 is terminated, the contacts 38 are again closed and thepreviously described circuit for the electromagnet 7 is again established with the result that the primary current for the transformer 71 is again connected thereto through the contact 37 of the magnet 7 and the second exposure then commences. The previously described locking circuit for the ma 'net 7 being a tacts 55am free to" e opened by the mo emept of the motor39 of the time rela he second-exposurenow proceeds-in con ormity in established the 'con- V 45 ing sheets.

with the adjustment of the time relay 9 and terminates when the locking circuit for the electromagnet' 7 is opened at the contact 38. The contacts 19 and 20 'of the magnet 7 are again closed and the relay 5 energized to attract its armature with the result that the contacts of the switch 2 are shifted to their left-hand terminals and the motor rotates in a counterclockwise direction. The rein-' forcing plate28 is lifted from the plate 26 under the influence of the springs 31 and the exposed film is wound upron the drum 49.

' The arrangement that has been described for effecting the movements of the reinforc- 1 ing sheet and of the film by means of the rotation of them' otor inlopposite directions is used in accordance with a further form of the invention in such a way that the size of the apparatus may be reduced to an extent which 2 will permit 'of the motor to be mounted in a film roll holder which contains the reinforcing plate and the film, as shown in Figures 3 and 4.; The saving in space is attained by the fact that the motor 3 is built into the 5 interior of the film drum 49. Said motorisattached to the one base plate 59 of the holder 60 by means of a frame 61.-

' of the shaft 34 there is carried a disk 63 which in turn bears the film drum 49. llhe connectio'n betweenthe shaft extension and the dish 63 is not a rigid one and the film drum is connected with the shaft 34.- by the spring 48. The drum 33 is connected with the motor shait y means of a gear train which is indicated by the wheels 64 and 65 and in this case also the coupling is an elastic one since the gear wheel is not rigidiy connected with the shaft, but is joined thereto by means of a spring 35. V

This form of construction renders it possible to examine, by means of a luminous screen, an object which is to be photographed before 7 the taking of the picture commences, the ob- I servation being made through the reinforc- The luminous screen 66 is laid upon the middle portion of the holder. The strip is provided at one end with a paper prolongation whichis; utilized to film into position for the purpose of exam ining the object. I 3

What is claimed is:

. 1. 7 In asystem for the production of stereo scopic X-ray photographs, the combination of-a movable film upon which successive exposures' are made, a motor for moving said .X-ray tubes alternately rendered. iefiectiv'e when making said (source of current for saidtubes, means opera ated by said source of current for alternately rendering said tubes effective, and means connectingsaid source to said motor todrive-the' ,same'inone direction and operatedby the first named means to reverse the direction of tonetube tothe other;

On an extension said source to said motor and'operable to' draw the nately rendered effective when makin exposures, at:

motor when said source is switched from 2; In a system for the production of stereoscopic X-ray hotographs, the combination of a movable upon which successive exposures are made, -a .motor formoving said film, two X-ray tubes alternately rendered effective when making said exposures, a source of current for said tubes, means operated by said source of current for alternately rendering said tubes-efiective, means connecting said source to said motor'to drive the same in. one direction and operated b, the first named means to reverse the direction of said motor when said sourceis switched from one \tube to the other, and time-controlled means governing the operation of the first and second-named means.

3. In a system for the production of stereo-i .scopic X-ray-photographs, the combination 7 of a movable film upon which successive exposures are made, a motor for moving said film, two X-ray tubes alternately rendered eifectivefwhen ma said exposures, at source of current for said tubes, a switchffor alternately connecting said tubes to said source of-current, a second switch connecting said source to said motor and operable to reverse the direction thereof, and anelectromagnetic device operable at thetermination of one exposure for actuating said switches.

4. In a system for the production of stereoscopic X-ray photographs, the combination of a movable filmnpon which successive ex posures are made, 'a-motor for moving said film, two X-ray tubes alternately rendered efiective "when making said exposures, a' source of current iOI said tubes, aswitch for alternately connecting said tubes: to said source-of current, a second switch connecting reverse the direction thereof, an elect-romag- 'netic device operable at the termination of one exposure for actuating said switches, and a time-controlled device governing the operation of said electromagnetic device.

5. In a system for the production. of stereoscopic X ray photographs, the combi nation of a movable film upon which successive exposures are made, a-reversible motor for moving said film, two X-ray tubes alterp p g said 1 5 exposures, a source of current for said. tubes, 1 and means operated by said source of current i for alternately rendering saidtubes effective and for reversing the direction of said motor.

A 6. in a system for the prod'uctionof stereoscopic X ray hotographs, the combination, of a movable upon which successive exposures are made, two 'X-raytubes alter- '-nately operated .to make said exposures, a i motor for moving said film, and means including a switching device for alternatelyopcrating said tubes and simultaneously reversing the direction ofsaidfmotor. 7. a'system for the pr duction, of stereoof a movable film uponwhich successive exposures are made, two X-ray tubes alternately operated to make said exposures, a motor for moving said film, means including a switching device for alternately operatingw said tubes and simultaneously reversing the direction of said motor, and a time-controlled switch for governing the operation of said switching device. 4 i.

8. In a system-for the roduction of stereoscopic X-rayphotograp is, the combination 1 of a movablcfilm upon which successive ex- 'posures are made, [a reversible motor for moving said film, two X-ray tubes alternately rendered efiective when making said ex 0- sunes, a source of current .for said tu s, means operated by said source of current tor alternately rendering said-tubes effective and forsimultaneously reversing the direction of said motor, and means for controlling the first named means so that said tubes will be rendered effective during predeterminedpcscopic X -ray '.riods of time.

" 9. In a system for the production of stereophotographs, the combination of a movable film upon which successive exposures are made, a source of current, two

X-ray tubes adapted to be alternately co nected to said source of current, a reversible motor'for moving said film, a switching device for said tubes and motor, a time-controlled switch for governing the operation x of said switching device, an electromagnetic device controlling the operation .of said time-controlled switch, a slow-acting relay for operating said switching device, a circuit said switching device is operated to connect .c

said third circuit to the other of said tubes and to reverse the direction of said motor, means thereafteroperated by said motor to interrupt the circuit of said relay, and means thereupon operable to again actuate said switching device.

MAX: ronLMANN. 

